I am planning to send data from a sensor to a mobile phone(such as iPhone) via mobile phone's trs connection(via audio jack). Since i have to use the audio channel, i need to convert the analogue signals to digital before sending to iPhone.
Does anybody have knowledge how can i achieve this in a simple way? What kind of micro controller and circuit components i should use?
I was planning to use Arduino as a micro controller. Some claims it happens by using FSK or Manchester encoding.
I need a simple schematics diagram for that, which i could not find.